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若尔盖高寒湿地土壤全氮空间分布特征

马坤,张颖,唐素贤,刘俊国*   

  1. (北京林业大学自然保护区学院, 北京 100083)
  • 出版日期:2016-08-10 发布日期:2016-08-10

Characteristics of spatial distribution of soil total nitrogen in Zoige alpine wetland.

MA Kun, ZHANG Ying, TANG Su-xian, LIU Jun-guo*   

  1. (School of Nature Conservation, Beijing Forestry University, Beijing 100083, China).
  • Online:2016-08-10 Published:2016-08-10

摘要: 选取若尔盖高寒湿地(红原县和若尔盖县)作为研究区域,运用野外调查采样、室内分析与地理信息系统的空间分析方法,对土壤1 m深全氮的空间分布特征进行研究,以期为全球变化背景下高寒湿地氮循环研究提供支撑。结果表明,土壤全氮含量和密度具有垂直分异现象,呈现随土层深度的增加而降低的趋势,较高值出现在0~0.3 m土层,且显著高于0.3~1.0 m土层。水平分布上,土壤全氮密度具有较强的空间异质性。在0~1.0 m土层,研究区内土壤全氮总储量为62.6 Tg,平均全氮密度为3.8 kg·m-3。常年淹水湿地0~1.0 m土层土壤平均全氮密度为4.0 kg·m-3,全氮储量为29.2 Tg,约占研究区内土壤全氮总储量的46.7%。

关键词: 碳通量, 区域剖分, 土壤呼吸, 采样策略

Abstract: To improve our understanding of the nitrogen cycle in the alpine wetlands, this study chose Zoige alpine wetland (Hongyuan  and Ruoergai counties) as study area and focused on spatial distribution of total nitrogen (TN) within soil layers (0-1.0 m), using the field investigation, laboratory analysis and GIS spatial analysis method. TN was vertically differentiated. The TN concentration and TN density decreased with increasing soil depth, being significantly higher in the topmost 0.3 m soil layer than in the 0.3-1.0 m soil layer. Horizontally, the distribution of TN was heterogeneous. The TN stock totaled 62.6 Tg in the uppermost 1.0 m soil layer of the entire study area, of which 53.4% was held in the upper most 0.3 m soil layer, with an average TN density of 3.8 kg·m-3. The TN stock in the uppermost 1 m soil layer of permanently flooded wetland totaled 29.2 Tg, accounting for 46.7% of the TN stock in the entire study area, with an average TN density of 4.0 kg·m-3.

Key words: soil respiration, carbon flux estimation, region division, sampling strategy.